What is Setpoint Ramping?

Many temperature controllers have the facility to ramp their effective setpoint towards the final target value at a predefined rate. A deviation alarm is often used with this feature to check that the process is closely following the ramp. When the setpoint reaches the top of the ramp, a “soak period” begins where the setpoint is maintained at this value.
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How Do PID Controllers Work? 

Where proportional control is used to minimize the oscillation characteristic of on/off control, PID control goes that bit further to reduce errors and provide accuracy and stability in a process. It does this by using the integral action and derivative actions to eliminate control deviation errors and to manage rapid process movements. All three PID terms need to tuned appropriately for the application requirements to achieve the best control.